4- A Hydraulic press has a ram of 30 cm diameter and a plunger of 2 cm diameter. It is used for lifting a weight of 35 kN. Find the force required at the plunger. 5- The diameters of a small piston and a large piston of a hydraulic jack are 45 mm and 100 mm respectively. Force of 0.09 kN applied on smaller in size piston. Find load lifted by piston if smaller in size piston is 40 cm above the large piston. The density of the fluid is 850 kg/m3.